Merge pull request #209 from guzba/master

svg improvements, emoji megatest, ctx blend test, remove seq[seq[Vec2]] from SomePath

src/pixie/fileformats/svg.nim

@@ -36,6 +36,13 @@ proc initCtx(): Ctx =
 proc decodeCtx(inherited: Ctx, node: XmlNode): Ctx =
   result = inherited
 
+  proc splitArgs(s: string): seq[string] =
+    # Handles (1,1) or (1 1) or (1, 1) or (1,1 2,2) etc
+    let tmp = s.replace(',', ' ').split(' ')
+    for entry in tmp:
+      if entry.len > 0:
+        result.add(entry)
+
   var
     fillRule = node.attr("fill-rule")
     fill = node.attr("fill")
@@ -157,7 +164,7 @@ proc decodeCtx(inherited: Ctx, node: XmlNode): Ctx =
   if strokeDashArray == "":
     discard
   else:
-    var values = strokeDashArray.replace(',', ' ').split(' ')
+    var values = splitArgs(strokeDashArray)
     for value in values:
       result.strokeDashArray.add(parseFloat(value))
 
@@ -178,55 +185,46 @@ proc decodeCtx(inherited: Ctx, node: XmlNode): Ctx =
       remaining = remaining[index + 1 .. ^1]
 
       if f.startsWith("matrix("):
-        let arr =
-          if f.contains(","):
-            f[7 .. ^2].split(",")
-          else:
-            f[7 .. ^2].split(" ")
+        let arr = splitArgs(f[7 .. ^2])
         if arr.len != 6:
           failInvalidTransform(transform)
         var m = mat3()
-        m[0, 0] = parseFloat(arr[0].strip())
-        m[0, 1] = parseFloat(arr[1].strip())
-        m[1, 0] = parseFloat(arr[2].strip())
-        m[1, 1] = parseFloat(arr[3].strip())
-        m[2, 0] = parseFloat(arr[4].strip())
-        m[2, 1] = parseFloat(arr[5].strip())
+        m[0, 0] = parseFloat(arr[0])
+        m[0, 1] = parseFloat(arr[1])
+        m[1, 0] = parseFloat(arr[2])
+        m[1, 1] = parseFloat(arr[3])
+        m[2, 0] = parseFloat(arr[4])
+        m[2, 1] = parseFloat(arr[5])
         result.transform = result.transform * m
       elif f.startsWith("translate("):
         let
-          components = f[10 .. ^2].split(" ")
-          tx = parseFloat(components[0].strip())
+          components = splitArgs(f[10 .. ^2])
+          tx = parseFloat(components[0])
           ty =
-            if components[1].len == 0:
+            if components.len == 1:
               0.0
             else:
-              parseFloat(components[1].strip())
+              parseFloat(components[1])
         result.transform = result.transform * translate(vec2(tx, ty))
       elif f.startsWith("rotate("):
         let
-          values = f[7 .. ^2].split(" ")
-          angle: float32 = parseFloat(values[0].strip()) * -PI / 180
+          values = splitArgs(f[7 .. ^2])
+          angle: float32 = parseFloat(values[0]) * -PI / 180
         var cx, cy: float32
         if values.len > 1:
-          cx = parseFloat(values[1].strip())
+          cx = parseFloat(values[1])
         if values.len > 2:
-          cy = parseFloat(values[2].strip())
+          cy = parseFloat(values[2])
         let center = vec2(cx, cy)
         result.transform = result.transform *
           translate(center) * rotate(angle) * translate(-center)
       elif f.startsWith("scale("):
         let
-          values =
-            if f.contains(","):
-              f[6 .. ^2].split(",")
-            else:
-              f[6 .. ^2].split(" ")
-        let
-          sx: float32 = parseFloat(values[0].strip())
+          values = splitArgs(f[6 .. ^2])
+          sx: float32 = parseFloat(values[0])
           sy: float32 =
             if values.len > 1:
-              parseFloat(values[1].strip())
+              parseFloat(values[1])
             else:
               sx
         result.transform = result.transform * scale(vec2(sx, sy))
@@ -242,6 +240,8 @@ proc stroke(img: Image, ctx: Ctx, path: Path) {.inline.} =
     ctx.stroke,
     ctx.transform,
     ctx.strokeWidth,
+    ctx.strokeLineCap,
+    ctx.strokeLineJoin,
     miterLimit = ctx.strokeMiterLimit,
     dashes = ctx.strokeDashArray
   )
@@ -330,8 +330,11 @@ proc draw(img: Image, node: XmlNode, ctxStack: var seq[Ctx]) =
       ctx = decodeCtx(ctxStack[^1], node)
       x = parseFloat(node.attrOrDefault("x", "0"))
       y = parseFloat(node.attrOrDefault("y", "0"))
-      width = parseFloat(node.attr("width"))
-      height = parseFloat(node.attr("height"))
+      width = parseFloat(node.attrOrDefault("width", "0"))
+      height = parseFloat(node.attrOrDefault("height", "0"))
+
+    if width == 0 or height == 0:
+      return
 
     var
       rx = max(parseFloat(node.attrOrDefault("rx", "0")), 0)

src/pixie/fonts.nim

@@ -25,11 +25,11 @@ type
     font*: Font
 
   Arrangement* = ref object
-    spans*: seq[(int, int)]
-    fonts*: seq[Font]
-    runes*: seq[Rune]
-    positions*: seq[Vec2]
-    selectionRects*: seq[Rect]
+    spans*: seq[(int, int)] ## The (start, stop) of the spans in the text.
+    fonts*: seq[Font] ## The font for each span.
+    runes*: seq[Rune] ## The runes of the text.
+    positions*: seq[Vec2] ## The positions of the glyphs for each rune.
+    selectionRects*: seq[Rect] ## The selection rects for each glyph.
 
   HAlignMode* = enum
     haLeft
@@ -110,6 +110,7 @@ proc defaultLineHeight*(font: Font): float32 {.inline.} =
   round(fontUnits * font.scale)
 
 proc newSpan*(text: string, font: Font): Span =
+  ## Creates a span, associating a font with the text.
   result = Span()
   result.text = text
   result.font = font
@@ -369,6 +370,7 @@ proc typeset*(
   typeset(@[newSpan(text, font)], bounds, hAlign, vAlign, wrap)
 
 proc computeBounds*(arrangement: Arrangement): Vec2 =
+  ## Computes the width and height of the arrangement in pixels.
   if arrangement.runes.len > 0:
     for i in 0 ..< arrangement.runes.len:
       if arrangement.runes[i] != LF:
@@ -382,6 +384,7 @@ proc computeBounds*(font: Font, text: string): Vec2 {.inline.} =
   font.typeset(text).computeBounds()
 
 proc computeBounds*(spans: seq[Span]): Vec2 {.inline.} =
+  ## Computes the width and height of the spans in pixels.
   typeset(spans).computeBounds()
 
 proc parseOtf*(buf: string): Font =

src/pixie/paths.nim

@@ -34,7 +34,7 @@ type
     commands*: seq[PathCommand]
     start, at: Vec2 # Maintained by moveTo, lineTo, etc. Used by arcTo.
 
-  SomePath* = Path | string | seq[seq[Vec2]]
+  SomePath* = Path | string
 
 const
   epsilon = 0.0001 * PI ## Tiny value used for some computations.
@@ -1164,14 +1164,6 @@ proc fillShapes(
     stopY = min(image.height, (bounds.y + bounds.h).int)
     blender = blendMode.blender()
 
-  when defined(amd64) and not defined(pixieNoSimd):
-    let
-      blenderSimd = blendMode.blenderSimd()
-      first32 = cast[M128i]([uint32.high, 0, 0, 0]) # First 32 bits
-      oddMask = mm_set1_epi16(cast[int16](0xff00))
-      div255 = mm_set1_epi16(cast[int16](0x8081))
-      vColor = mm_set1_epi32(cast[int32](rgbx))
-
   var
     coverages = newSeq[uint8](image.width)
     hits = newSeq[(float32, int16)](4)
@@ -1190,51 +1182,58 @@ proc fillShapes(
     # Apply the coverage and blend
     var x = startX
     when defined(amd64) and not defined(pixieNoSimd):
-      # When supported, SIMD blend as much as possible
-      for _ in countup(x, image.width - 16, 4):
-        var coverage = mm_loadu_si128(coverages[x].addr)
-        coverage = mm_and_si128(coverage, first32)
-
+      if blendMode.hasSimdBlender():
+        # When supported, SIMD blend as much as possible
         let
-          index = image.dataIndex(x, y)
-          eqZero = mm_cmpeq_epi16(coverage, mm_setzero_si128())
-        if mm_movemask_epi8(eqZero) != 0xffff:
-          # If the coverages are not all zero
-          if mm_movemask_epi8(mm_cmpeq_epi32(coverage, first32)) == 0xffff:
-            # Coverages are all 255
-            if rgbx.a == 255 and blendMode == bmNormal:
-              mm_storeu_si128(image.data[index].addr, vColor)
+          blenderSimd = blendMode.blenderSimd()
+          first32 = cast[M128i]([uint32.high, 0, 0, 0]) # First 32 bits
+          oddMask = mm_set1_epi16(cast[int16](0xff00))
+          div255 = mm_set1_epi16(cast[int16](0x8081))
+          vColor = mm_set1_epi32(cast[int32](rgbx))
+        for _ in countup(x, image.width - 16, 4):
+          var coverage = mm_loadu_si128(coverages[x].addr)
+          coverage = mm_and_si128(coverage, first32)
+
+          let
+            index = image.dataIndex(x, y)
+            eqZero = mm_cmpeq_epi16(coverage, mm_setzero_si128())
+          if mm_movemask_epi8(eqZero) != 0xffff:
+            # If the coverages are not all zero
+            if mm_movemask_epi8(mm_cmpeq_epi32(coverage, first32)) == 0xffff:
+              # Coverages are all 255
+              if rgbx.a == 255 and blendMode == bmNormal:
+                mm_storeu_si128(image.data[index].addr, vColor)
+              else:
+                let backdrop = mm_loadu_si128(image.data[index].addr)
+                mm_storeu_si128(
+                  image.data[index].addr,
+                  blenderSimd(backdrop, vColor)
+                )
             else:
+              # Coverages are not all 255
+              coverage = unpackAlphaValues(coverage)
+              # Shift the coverages from `a` to `g` and `a` for multiplying
+              coverage = mm_or_si128(coverage, mm_srli_epi32(coverage, 16))
+
+              var
+                source = vColor
+                sourceEven = mm_slli_epi16(source, 8)
+                sourceOdd = mm_and_si128(source, oddMask)
+
+              sourceEven = mm_mulhi_epu16(sourceEven, coverage)
+              sourceOdd = mm_mulhi_epu16(sourceOdd, coverage)
+
+              sourceEven = mm_srli_epi16(mm_mulhi_epu16(sourceEven, div255), 7)
+              sourceOdd = mm_srli_epi16(mm_mulhi_epu16(sourceOdd, div255), 7)
+
+              source = mm_or_si128(sourceEven, mm_slli_epi16(sourceOdd, 8))
+
               let backdrop = mm_loadu_si128(image.data[index].addr)
               mm_storeu_si128(
                 image.data[index].addr,
-                blenderSimd(backdrop, vColor)
+                blenderSimd(backdrop, source)
               )
-          else:
-            # Coverages are not all 255
-            coverage = unpackAlphaValues(coverage)
-            # Shift the coverages from `a` to `g` and `a` for multiplying
-            coverage = mm_or_si128(coverage, mm_srli_epi32(coverage, 16))
-
-            var
-              source = vColor
-              sourceEven = mm_slli_epi16(source, 8)
-              sourceOdd = mm_and_si128(source, oddMask)
-
-            sourceEven = mm_mulhi_epu16(sourceEven, coverage)
-            sourceOdd = mm_mulhi_epu16(sourceOdd, coverage)
-
-            sourceEven = mm_srli_epi16(mm_mulhi_epu16(sourceEven, div255), 7)
-            sourceOdd = mm_srli_epi16(mm_mulhi_epu16(sourceOdd, div255), 7)
-
-            source = mm_or_si128(sourceEven, mm_slli_epi16(sourceOdd, 8))
-
-            let backdrop = mm_loadu_si128(image.data[index].addr)
-            mm_storeu_si128(
-              image.data[index].addr,
-              blenderSimd(backdrop, source)
-            )
-        x += 4
+          x += 4
 
     while x < image.width:
       if x + 8 <= coverages.len:
@@ -1328,11 +1327,11 @@ proc fillShapes(
       inc x
 
 proc miterLimitToAngle*(limit: float32): float32 =
-  ## Converts milter-limit-ratio to miter-limit-angle.
+  ## Converts miter-limit-ratio to miter-limit-angle.
   arcsin(1 / limit) * 2
 
 proc angleToMiterLimit*(angle: float32): float32 =
-  ## Converts miter-limit-angle to milter-limit-ratio.
+  ## Converts miter-limit-angle to miter-limit-ratio.
   1 / sin(angle / 2)
 
 proc strokeShapes(
@@ -1528,11 +1527,7 @@ proc fillPath*(
     mask = newMask(image.width, image.height)
     fill = newImage(image.width, image.height)
 
-  mask.fillPath(
-    parseSomePath(path, transform.pixelScale()),
-    transform,
-    windingRule
-  )
+  mask.fillPath(path, transform, windingRule)
 
   case paint.kind:
     of pkSolid:
@@ -1604,7 +1599,7 @@ proc strokePath*(
     fill = newImage(image.width, image.height)
 
   mask.strokePath(
-    parseSomePath(path, transform.pixelScale()),
+    path,
     transform,
     strokeWidth,
     lineCap,

tests/emoji_megatest.nim

@@ -0,0 +1,59 @@
+import cligen, os, pixie, pixie/fileformats/svg, strformat
+
+# Clone https://github.com/twitter/twemoji
+# Check out commit 59cb0eacce837d0f5de30223bd8f530e447f547a
+
+# Clone https://github.com/hfg-gmuend/openmoji
+# Check out commit c1f14ae0be29b20c7eed215d1e03df23b1c9a5d5
+
+type EmojiSet = object
+  name: string
+  path: string
+
+const
+  emojiSets = [
+    EmojiSet(name: "twemoji", path: "../twemoji/assets/svg/*"),
+    EmojiSet(name: "openmoji", path: "../openmoji/color/svg/*")
+  ]
+  width = 32
+  height = 32
+
+proc renderEmojiSet(index: int) =
+  let emojiSet = emojiSets[index]
+
+  var images: seq[(string, Image)]
+
+  for filePath in walkFiles(emojiSet.path):
+    let (_, name, _) = splitFile(filePath)
+    var image: Image
+    try:
+      image = decodeSvg(readFile(filePath), width, height)
+    except PixieError:
+      echo &"Failed decoding {name}"
+      image = newImage(width, height)
+    images.add((name, image))
+
+  let
+    columns = 40
+    rows = (images.len + columns - 1) div columns
+    rendered = newImage((width + 4) * columns, (height + 4) * rows)
+
+  for i in 0 ..< rows:
+    for j in 0 ..< max(images.len - i * columns, 0):
+      let (_, icon) = images[i * columns + j]
+      rendered.draw(
+        icon,
+        vec2(((width + 4) * j + 2).float32, ((height + 4) * i + 2).float32),
+        bmOverwrite
+      )
+
+  rendered.writeFile(&"tests/images/svg/{emojiSet.name}.png")
+
+proc main(index = -1) =
+  if index >= 0:
+    renderEmojiSet(index)
+  else:
+    for i in 0 ..< emojiSets.len:
+      renderEmojiSet(i)
+
+dispatch(main)

tests/test_context.nim

@@ -515,3 +515,19 @@ block:
   drawDashedLine(@[12.float32, 3, 3]);
 
   image.writeFile("tests/images/context/setLineDash_1.png")
+
+block:
+  let
+    image = newImage(300, 150)
+    ctx = newContext(image)
+
+  image.fill(rgba(255, 255, 255, 255))
+
+  var paint = Paint(kind: pkSolid, color: rgba(0, 0, 255, 255))
+  paint.blendMode = bmExclusion
+
+  ctx.fillStyle = paint
+
+  ctx.fillRect(10, 10, 100, 100)
+
+  image.writeFile("tests/images/context/blendmode_1.png")